<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div>
  <h1>登录页面</h1>
  <input type="text" placeholder="用户名" v-model="user.username">
  <input type="password" placeholder="密码" v-model="user.password">
  <input type="button" value="登录" @click="login()">

</div>
<script src="https://cdn.bootcdn.net/ajax/libs/axios/0.21.1/axios.min.js"></script>
<script src="https://cdn.staticfile.org/vue/2.2.2/vue.min.js"></script>
<script>
    let v = new Vue({
        el:"body>div",
        data:{
            user:{
              username:"",
              password:""

            }
        },
        methods:{
          login(){
            //发出异步请求 服务器返回1成功,2用户名不存在,3密码错误
             axios.post("/login",v.user).then(function (response) {
               if(response.data==1){
                  alert("登录成功!") ;
                 location.href="/";
               }else if(response.data==2){
                  alert("用户不存在!");
               }else{
                 alert("密码错误!");

               }

             })
            }
        }
    })
</script>
</body>
</html>